Bar-bending machine



s. MACQMBER BAR BENDING MACHINE Sept. 4, 1928.

Fi led Sept. 21, 1925 2 Sheets-Sheet sgsi. 4, 1928. 1,683,366

S. MACOMBER BAR BENIJING MACHINE Filed Sept. 21, 1925 2 Sheets-Sheet 2 15 a j \3 j 4 K 4/ IO 5 I I0 ,7 El '4 '4 INVENTOR. v a 6 l/ Q J M ATTORNEYS Patented Sept. 4-, 1928.

more rrs STANLEY MACOIVIBER, OF MASSILLON, OHIO, ASSIGNOR TO THE MACOMBER STEEL COMPANY, OF CANTON, OEIOyA CORPORATION OF OHIO.

BAn-Bnnnme MACHINE.

Application filed September 21, 1925. Serial No; 57,608.

The present improvements relate more particularly to mechanism for bendmg a rod or bar in opposite directions so as to put a 2-bend offset in such a rod or bar, both 8 bends being in the same plane and the angles thereof being the same so as to leave the offset portion parallel to the mam body of the bar. Bars with their ends thus bent are variously used .as web-members 1n trusses 10 and truss-like structural units as well as for other purposes such as tl1616l11f01'6111g of concrete walls, etc.

. It has been found impracticable to employ a bulldozer for the purpose indicated since this involves taking a die the shape of the desired bend and then forcing the straight bar into position; this for the reason that an operationsuch as the one just described will cause at least one end of the bar to be drawn over one point of the die and as a result the bar will be 'continually'pulled through an arc, first bending and then straightening. Such treatment of the bar obviously reduces its strength for structural purposes.

The object, accordingly, of the present improvements is to provide a mechanism adapted actually to bend the bar at the po nt of bend, keeping that part of the bar between bends always straight, and to this end, the invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims, the annexed drawings and the following description setting forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings V Fig. 1 is a plan view and Fig. 2 a side elevation of one type of machine constructedto bend rod or bar stock 1n accordance'with my present improved method; Figs. 3 and 4 illustrate more or less diagrammatically the operation of such machine; Figs. 5 and 6 are respectively a plan view and side elevation of another form of machine designed to operate in substantially the same fashion as such first type of machine; and Fig. 7

is a sectional view of a detail of such second machine, the plane of the sectionlbeing indicated by the line 77, Fig. 5..

The machine illustrated in Figs. 1 and 2, so far as its general framing and driving is concerned includes a horizontal table 1, in the center ofwhich is located a small horizontal cast plate 2 that is adapted to be rotated by lever control inone direction and reversed by hand. The details of the mechanismby which such plate isv thus adapted to be rotated fornrno part of the present invention and it will accordingly sufiice to note that such plate is mounted on theupper end of aYvertical shaft 3 that projects through an opening in the table 1 and that for the purpose 'of' rotating the shaft and plate in a clockwise direction, as viewed in B 1g. 1, said shaft may be clutched to a suitable driving gear 4, while a hand lever; 5

bar may be directly over the center of the rotating plate 2.

Supported upon the rotatable plate 2 is a i radially projecting arm 10 which is similarly secured to said plate by means of bolts 11,

passing through slots in the arm, so that the. latter may be bodily adjusted transversely of the center of the plate. The lat ter is provided adjacent its forward face with an undercut'groove 12 in which are adjustably slidably held two blocks 13 and 14.

The first of these blocks will normally be located closely adjacent the inner end of the arm, i. e-., thecenter of-plate 2, while the locationof the outer block 14 will be varied, dependent upon the length of the rod or bar between successive bends. Secured to the table top so as to face said arm 10 is a stop 15 that has a horizontally extending face, said stop being carried by brackets 16 on a slide ll'that is adjustably secured by means of bolts 18to dercut slots '19 in 'such tabletop.

In operation, assuming a rod orbar R (see to be placed between the blocks parallel unor jaws 6 and 7 soxas toallow a suitable length thereof to project, alongside arm 10,

andassuming the 'blocks13 and lt on the V latter to be correctly positioned, the arm is swun in a counter-clockwise direction by rotating shaft 3 and plate 2. The first eifect of such rotation will be to bend the projecting portion of the bar at the point where it leaves the blocks 6 and 7 until such projecting portion assumes the position shown in dotted outline in Fig. 3. However, before such first bend is completed, the block 14 will start a second bend as it forces such projecting portion of the rod against stop 15'. -Botli bends will be completed (see Fig. 4) as said block 14 on arm 10 finally pinches the bar against the stop 15, the travel of the arm'being stopped as for example by an automatic trip when this stage in the operation is'reached. Thereupon the arm is rotated back into its original position by hand.

The machine illustrated in Figs. 5, 6 and 7, so far as its general structure is concerned, is

-. analogous in framing and supports to the type of machine shown in Figures 1 and 2. However the center of rotatable plate 20 here lies flush with the top of the table 21 and is designed to be power rotated in both directions subject to hand control. Two parallel bars 22 are secured to the top of the table by means of bolts 23 that pass through slotted holes insaid bars so as to permit their adjustment in a fashion similar'to that of blocks 6 and 7.: Directly secured to the rotating plate 20 is an arm 24 of the. cross-sectional orm shown in Fig. 7, and slidably adjustably secured on said arm are two blocks 25' and 26. A stop plate 27 is mounted on the table top, said stop being adjustable at right anglesto the line of the opening between bars 22. u

The operation of this second form of machine is substantially the same as that of the first form, such operation being clearly indicated by the showing in dotted outline of the positions successively occupied by the projecting rod end in Fig. 5.

In both types of machine it will be observed that the two bends of the bar are accomplished by one motion, also that the bends leavethe ofi'set portion or extremity of the rod parallel with the main body of the latter. Bars ranging from inch diameter to 9; inch diameter may be readily bent in the fashion thus described on the foregoing machines with bends varying from 8 inches to 12 inches in their distance apart y from each other, while the terminal or offset portion maybe of variable length up to 10 inches. Obviously the machine is not limited to operation with rod of .any particular-dimension, the foregoing dimensions and lengths being merely illustrative.

Other modes of applying the principles of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the follow ing claims or the equivalentof such stated means be employed.

I therefore particularly point out and distinctly claim as my invention the path of travel of the outer of the blocks on said arm and having a stop-face lying substantially parallel with said gripplng blocks.

2. In mechanism of the character described, the combination of a pair of parallel blocks adapted to grip a length of bar therebetween; an arm oscillatorily mounted about an axis adjacent one end of said blocks; two blocks relatively adjustably mounted on said arm and adapted to contact at longitudinally spaced points with a portion of such bar'projecting beyond said firstuiamed blocks; and a stop located in the path of travel of the outer of the blocks on said armand presenting an elongated face may be pressed by said block.

3. In mechanism of the character described, the combination of a pair of'relaagainst which such projecting bar-portion tively adjustable parallel blocks adapted to the outer of the blocks on said arm, and

presenting an elongated face against which such projecting bar-portion may be pressed by said block, such stop-face lying substantially parallel with said gripping device.

4. In mechanism of the character described the combination of a stationary device adapted to grip a length of bar; a member oscillatorily mounted about an axis adjacent one end of said device; two blocks mounted on said-member and adapted to. contact during a single movement of said member at longitudinallyspaced points with a portion of'such bar projecting beyond said device to give such projecting portion. of the bar an angular formation; and a sto 10- one ofsaid'blocks therebyto give the extreme bar end a formation relatively angular to that of the intermediate part of said projecting bar portion.

cated in the path of travel of said bar and 5. In mechanism of the character described, the combination of a stationary device adapted to grip a length of bar; a member oscillatorily mounted about an axis adjacent one end of said device; tWo blocks mounted on said member and adapted to contact at longitudinally spaced points with a portion of such bar projecting beyond said device; and a stop located in the path of travel of said bar and having a stop-face lying substantially parallel With said device, thereby to give the extreme bar end an angular formation parallel to that of the bar portion gripped by the device.

6. In mechanism of the character described, the combination of a stationary device adapted to grip a length of bar; a member oscillatorily mounted about an axis adjacent one end of-said device; two relatively adjustable blocks mounted on said member and adapted to contact during a single movement of said member at longitudinally spaced points With a portion of such bar projecting beyond said device; and a stop located in the path of travel of the outer of said blocks and having an elongated stopface, thereby to give the extreme bar end a formation relatively angular to that of the intermediate part of the projecting bar portion.

Signed by me this 18 day of Sept, 1925.

, STANLEY MACOMBER. 

